Changes to Update an SMS activity

added the media type application/json for the response with the status 400

added the media type application/json for the response with the status 401

added the media type application/json for the response with the status 404

added the non-success response with the status 403

added the non-success response with the status 429

added the optional property created_by_agent_id to the response with the 200 status

response property agent_config_id deprecated

added the required property caller_id_reason to the response with the 200 status

added the new optional request property caller_id_mode

added the required property caller_id_mode to the response with the 200 status